سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 43
The Book of Purification
Allowing The Usage Of One Stone For Cleaning
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاَهِيمَ، قَالَ أَنْبَأَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ هِلاَلِ بْنِ يِسَافٍ، عَنْ سَلَمَةَ بْنِ قَيْسٍ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ إِذَا اسْتَجْمَرْتَ فَأَوْتِرْ .
It was narrated from Salamah bin Qais that the Messenger of Allah (ﷺ) said: "When you clean yourselves (with stones, after defecating), use an odd number."
Sunan an-Nasa'i, 43Sahih (Darussalam)